Seed readily available in the 'pea' section (Wilko, say), sow in march/april - plants will need some support so let them climb up some netting, then they will flower and form pods, and you pick the pods when they are flat and the peas have not started to swell.

i tried last year but didnt have any sucses but who dares wins and all that i am having another try this year

Don't worry, you're not alone. My mangetout harvest was pathetic last year, starting from being nibbled badly by slugs as seedlings. It was partly my fault that I put too many plants per cane and didn't support them properly (using kitchen ties - now how sloppy is that!). Otherwise they're relatively easy to grow as I've had better years before. This time I may use chicken wire for the mangetout to climb up, this way I don't have to stress myself out wondering how many mangetout I should allow per cane. Somebody I know grows peas this way and looks very effective with ease of picking too.